Commitments And Contingent Liabilities (Minimum Fuel Purchase Requirements) (Detail) - PSEG Power [Member] $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Long-term Purchase Commitment [Line Items]
Coverage percentage of nuclear fuel commitments of uranium, enrichment, and fabrication requirements for current year	100.00%
Nuclear Fuel Uranium [Member]
Long-term Purchase Commitment [Line Items]
Total five-year minimum purchase requirements	$ 194
Nuclear Fuel Enrichment [Member]
Long-term Purchase Commitment [Line Items]
Total five-year minimum purchase requirements	314
Nuclear Fuel Fabrication [Member]
Long-term Purchase Commitment [Line Items]
Total five-year minimum purchase requirements	170
Natural Gas [Member]
Long-term Purchase Commitment [Line Items]
Total five-year minimum purchase requirements	$ 1,196